You are an intelligent guy John.  And you've been around these cars long
enough to know that until you actually see the car, you cannot put an honest
or valid value on it.  The car could be worth $6K or it could be worth what
you wrote.  The market will determine what its worth.  I've seen too many
instances where an owner is told what a certain make and model will bring
(with no mention of color, options, mechanical condition, drivability, etc,
etc, etc ).  The owner now prices his car out of the market and someonwho
would like to have the car is left out.  Months or even years later the
seller lets it go for its market value which is considerably under the price
at which he started.
My President looked really good in the pictures I was sent.  When it
arrived, it wouldn't start, it wouldn't stop, the oil filter hadn't been
changed in 30+ years, the radiator leaked, the carb needed rebuild, the
entire brake system had to be rebuilt, the fuel pump diaphram was shot, the
driver door latch was shot, and the paint had more orange peel than a 100
acre grove.  If I had it to do again, I would paid the guy $2000 to $2500
less than I paid, or passed.
Now that fellow has a figure in mind, he's planning how to spend the money,
and when he doesn't get it, he's going to be pissed off at the buyer who
wouldn't pay "what it was worth"..